SHORT ANSWER. Write the word or phease that best comgletes ear Use the siven inf

Question

SHORT ANSWER. Write the word or phease that best comgletes ear Use the siven information to find the wsact value of the osgression. 13)cos e,-??, lies in quadrant Iv tind sin 20. stement or answes he qoevtion MULTIPLE CHOICE. Choose the une alternative thet best completes the Use a half-angle farmula to find the exact value of the expressi 14) cos2 15) - Use the given information to find the exact value of the trigonometric 1:5) sine÷ elies in quadrant I Find sin A) B) Express the product as a sum or difference. A) 2(cus 9x- cos 3x) C) sin (cos 18x2) 16) sin 6x cos 3x B) (sin 9x + cos 3x) (sin 9x + sin 3x) ORT ANSWER. Write the word or phrase that best completes each statement or answe d all solutions of the equation. 17) 2 cosx+3-

Explanation / Answer

13) cos theta = 15/17

base = 15

hypotenuse = 17

perpendicular = sqrt ( 17^2 - 15^2 ) = 8

sin theta = - 8 / 17

hence, sin 2 theta = 2 sin theta cos theta

= 2 ( -8/17 ) ( 15/17 )

sin 2 theta = - 240 / 289

14) cos 5pi/12

cos 5pi/12 = cos ( pi/6 + pi/4 )

cos (pi/6 ) cos (pi/4) - sin ( pi/6 ) sin (pi/4 )

( sqrt 2/2 ) ( sqrt 3/2 ) - ( sqrt 2/2 ) (1/2)

= ( sqrt 6 - sqrt 2 ) / 4

option c is correct

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.